Napstablook is a melancholic ghost character from the game Undertale. Known for their shy and introverted personality, Napstablook prefers to spend time alone listening to music and composing tunes. Despite their gloomy demeanor, they are kind-hearted and gentle. Napstablook plays a minor but memorable role in the story, interacting with the protagonist in several encounters. Their unique dialogue and music contribute to the quirky and emotional atmosphere of the game, making them a fan favorite among Undertale's diverse cast.